iodine forms I3 but flourine does not form F3

F3 ion does not exist due to its small size and absence of vacant d-orbital  to expand its covalency from one to two whereas Iodine have large size and vacant d orbital to form I3 ion.
Note : Size is the major reason for non existence of F3 ion.

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due to anomolous behaviour of Flourie..

Flourine dont have vaccent d orital to expand its octed and flourine forms p pie- p pie overlap

thats why flourine dont form F3 ions

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